Hengill, Iceland - Hengill was formed from a Palagomite tuff, it is a central volcano and has a giant magma chamber beneath it. When thick basalt lava flows cool, they form hexagonal cracks, called columnar joints
Joffrey Gorge, Karijini National Park, Australia by Christian Fletcher. "In Joffre Gorge, one can truly appreciate the power of water shaping the landscape. The gorge hosts impressive waterfalls, deep pools and breath-taking views.